onebad928s

Ok here we go, One night the rear started making a few odd sounds like a banging if you want to say as you make a turn. I called 928 intl to see what they think it might be. They took a guess cv joints. Ok i order new ones to get the wrong ones delivered. Simple mistake from there rebuilder trying something new. I called 928 intl back to figure out what to do and they sent me new ones again but the correct ones. Now i already had the wrong ones in, thats how i figured they were wrong from the fitment. I received a correct one from 928 intl and put it in on the passenger side and drove the car a bit. (one correct axle, one wrong axle) i still had one wrong axle in since the other correct one was being dropped shipped to me from the rebuilder. So im driving the car doing my thing and no problems. The other correct axle comes today so i popped it in and went for a drive. About 2 miles down the road (bang.bang,bang) as i go around a turn (left and right) I get the car home and called 928 intl up to say whats going on. It felt like a pure posi locker going into turns. There stunned and think maybe its now in the rear. I explained it could be perhaps but why only on the correct axles and not the wrong one and why not on straightaways. I think if its rear nomatter what axle, turn or straightaway therte would be a noise. Any opinions would be great

Lou
83 928 5peed

Jim @ EuroWerks

So you think it might be in the diff ? Do you have limited slip ? Remove both axles , hold a stub axle in each hand . with the car in neutral try to 1st move both stub axles the same direction at the same time, then try to hold one and turn the other. What happens ? Do you feel the clunck ?

onebad928s

as of right now, if i jack up the car and turn one tire the other moves in the same direct. If i jack up one side with one tire up and one tire down the tire up turns easily. 928 intl reccommended to take the rear cover off and look at the gears for wear, loose parts or cracks.

Lou
83 928 5speed

Jim @ EuroWerks

Not a bad Idea, do you feel any roughness while turning the wheels ?

Jim @ EuroWerks

Did you ck the rear wheel brgs?

ErnestSw

"oh no bad sound from the drivers rear"

Sounds like an exhaust problem.

Jim @ EuroWerks

Ernest, I'm now shaking my head in disgust.

ErnestSw

Sorry,
The devil made me do it.

onebad928s

Jim,
No roughness was felt and the bearings seemed fine when i had the axle out. It only does it on the original axle and the new rebuilt original replacement axle when i turn and not on straightaways. With the wrong axle in that was sent by mistake it doesn't do it at all. Im thinking if it was the differential either on straightaways,turns or no matter what axle that is used the problem would be consistent.

Ernest,
HAHA

Lou
83 928 5speed

jserio

Lou, If wrong is right and right is wrong what does that tell you? Your problem must be that axle. I would put aside the original axle and the wrong one. I would have 928 send you a correct used one and try that. If it works and no noise then your in like flint. If there is still noise then see what is different with the wrong axle. That's my 2 cents anyway.

SharkSkin

Check to make sure the groove is oriented correctly on the CV joint itself:



If they are not "new" or "rebuilt":

Get the back end of the car up on ramps, over a pit, etc so you can get under there with the suspension in its normal position. Have the brake set, trans in neutral so the halfshafts are not under tension.

Reach up and wiggle the halfshafts; rotate them back and forth while sliding them in and out of the end joints. see if there is some point at which you can detect lots of play in the direction you are rotating. This will check the outer CV for play.

Now reach up and grab the inner CV near the tranny, and rotate it back and forth to see if there is excessive play between the inner joint and the halfshaft. If they seem tight, pop the rear cover on the diff. Look for issues with the spider gears. IIRC there is a clip that can fall off the top cover and drop down through the works. Or you may have simply lost a tooth.

onebad928s

Joe,
I did check the differences between the shafts (all 3) the wrong one is built differently than the original from the car and the correct replacement its actually smaller in length.

Dave,
my next step would be to pop the cover off. I did the twist test with Tom from 928 intl. on the phone and there was no twist on the cv just a slide back and fourth action.

Lou
83 928 5speed

Gretch

Bored, eh Ernie?

Jim bailey - 928 International

O K ... the ring and pinion the basic drive gears are probably fine however the spider gears (differential pinions) inside of the differential ...the gears which allow one wheel to turn at a different speed when you go around a corner or the inside wheel to spin wheel and burn rubber ......are probably toast........ That might explain a lack of noise when going straight but issues when turning or burning .........

SharkSkin

OK, good.... just thought I'd toss that in, sincce just wiggling the shaft only checks the outer joint. Good luck!

D